Waddledee: Use cached Vbus presence
Waddledee: Use cached Vbus presence

Convert pd_snk_is_vbus_provided() to return the cached Vbus presence
from the charger driver.

BRANCH=None
BUG=None
TEST=on waddledee, confirm charger and powered dongle can connect to
both ports

Signed-off-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Change-Id: If45956072f41f8a20e5880825e687230ef239a1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2191375
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec